Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D217/00—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems
  • C07D217/02—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with only hydrogen atoms or radicals containing only carbon and hydrogen atoms, directly attached to carbon atoms of the nitrogen-containing ring; Alkylene-bis-isoquinolines
  • C07D217/04—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with only hydrogen atoms or radicals containing only carbon and hydrogen atoms, directly attached to carbon atoms of the nitrogen-containing ring; Alkylene-bis-isoquinolines with hydrocarbon or substituted hydrocarbon radicals attached to the ring nitrogen atom
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
  • A61P1/14—Prodigestives, e.g. acids, enzymes, appetite stimulants, antidyspeptics, tonics, antiflatulents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/26—Psychostimulants, e.g. nicotine, cocaine
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D217/00—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems
  • C07D217/02—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with only hydrogen atoms or radicals containing only carbon and hydrogen atoms, directly attached to carbon atoms of the nitrogen-containing ring; Alkylene-bis-isoquinolines
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D217/00—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems
  • C07D217/12—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with radicals, substituted by hetero atoms, attached to carbon atoms of the nitrogen-containing ring
  • C07D217/14—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with radicals, substituted by hetero atoms, attached to carbon atoms of the nitrogen-containing ring other than aralkyl radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D217/00—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems
  • C07D217/22—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the nitrogen-containing ring
  • C07D217/24—Oxygen atoms

Definitions

• the present invention relates to novel compounds, to their preparation and to pharmaceutical compositions containing them.
• British patent specification No. 1,335,261 discloses inter alia that the compounds of the formula (I): ##STR3## wherein A 1 is hydrogen or a C 1-4 alkyl group, A 2 is a C 1-4 alkyl or phenyl group, A 3 is a hydrogen atom A 4 is a halogen atom or a nitro, amino or substituted amino group and A 5 is a hydrogen atom or C 1-4 alkyl group possess antidepressant activity.
• a 1 is hydrogen or a C 1-4 alkyl group
• a 2 is a C 1-4 alkyl or phenyl group
• a 3 is a hydrogen atom
• a 4 is a halogen atom or a nitro, amino or substituted amino group
• a 5 is a hydrogen atom or C 1-4 alkyl group possess antidepressant activity.
• 3,870,722 discloses inter alia that the compounds of the formula (I) wherein A 1 is a hydrogen atom, A 2 is a methyl group, A 3 is a C 4-8 alkyl group, A 4 is a hydrogen atom and A 5 is a lower alkyl group possess hypolipidaemic activity.
• R 1 is a C 1-6 alkyl, C 3-6 cycloalkyl phenyl, naphthyl, aralkyl, substituted phenyl or substituted naphthyl group
• R 2 is a group: ##STR5## wherein R 6 is a hydrogen atom or a C 1-6 alkyl group, R 7 is a hydrogen atom or a C 1-6 alkyl, phenyl, tolyl, or benzyl group or R 6 is linked to R 7 so that the NR 6 R 7 moiety is a 5-, 6- or 7-membered ring, R 8 is a hydrogen atom or a C 1-4 alkyl group or is joined to R 6 to form part of a morpholino ring
• substituted phenyl or naphthyl group is meant a phenyl or naphthyl group substituted by one or two halogen atoms or trifluoromethyl, C 1-4 alkyl, hydroxy, C 1-4 alkoxy, nitro, amino, methylamino, dimethylamino, diethylamino, carboxy, methoxycarbonyl, ethoxycarbonyl, cyano, carboxamido, sulphonamido, trifluoromethoxy or trifluoromethylthio groups or by an acyl group containing up to 7 carbon atoms.
• aralkyl group is meant a benzyl or benzhydryl group or a benzyl or benzhydryl group substituted by one or two halogen atoms or trifluoromethyl, C 1-4 alkyl, hydroxy, C 1-4 alkoxy, nitro, amino or cyano groups.
• R 1 is a phenyl or naphthyl group or a phenyl group substituted by a fluorine, chlorine or bromine atom or a methyl, methoxy or trifluoromethyl group.
• R 2 is a group: ##STR6## wherein R 6 and R 7 are as defined in relation to formula (II)
• R 6 is a hydrogen atom or a methyl group
• R 7 is a hydrogen atom or a methyl, ethyl or benzyl group.
• R 3 is a hydrogen atom or a methyl group.
• R 3 is a hydrogen atom.
• R 4 is a hydrogen atom or a C 1-4 alkyl or benzyl group.
• R 4 is a methyl group.
• R 5 is a hydrogen atom or C 1-4 alkyl group
• R 5 is a hydrogen atom.
• R 2 include those of the sub-formulae (a) - (d): ##STR7##
• Particularly suitable compounds of the formula (II) include those of the formulae (III), (IV), (V) and (VI): ##STR8## and salts thereof wherein R 11 is a hydrogen, fluorine or chlorine atom or a nitro, trifluoromethyl, methyl or methoxy group and R 12 and R 13 are each a hydrogen atom or a methyl or ethyl group.
• R 11 is a hydrogen, fluorine or chlorine atom or a trifluoromethyl group.
• Preferred compounds for inducing anorexia include those wherein R 11 is a 4 -- fluorine or 4 -- chlorine atom or a 4 -- trifluoromethyl group.
• Preferred compounds useful in the treatment of depression include those wherein R 11 is a 3 -- trifluoromethyl group.
• R 12 is a hydrogen atom or a methyl group.
• R 12 is a methyl group.
• R 13 is a methyl or ethyl group.
• R 13 is a methyl group.
• the compounds of the formula (II) exist as a number of stereoisomers. Accordingly the present invention provides the compounds of the formula (II) as pure stereoisomers as well as mixtures of these stereoisomers.
• the compounds of this invention are nitrogenous bases they are able to form acid addition salts in conventional manner.
• such salts are those formed from pharmaceutically acceptable organic or inorganic acids such as citric, acetic, propionic, lactic, tartaric, mandelic, succinic, oleic, glutaric, gluconic, methanesulphonic, toluenesulphonic, sulphuric, phosphoric, hydrobromic or hydrochloric acid.
• compositions which comprise a compound of this invention as hereinbefore described together with a pharmaceutically acceptable carrier.
• compositions of this invention are adapted for oral administration to humans although compositions adapted for parenteral administration are also envisaged.
• the most suitable dosage forms are unit dosage forms such as tablets, capsules, sachets and the like which contain a predetermined quantity of active material.
• Such unit dosage forms normally contain from 0.05 to 200 mg. and preferably from 0.5 mg. to 100 mg. of active material and may be taken once a day or several times a day according to the dose desired. Generally a human adult will be administered from 0.5 to 500 mgs. per day.
• composition of this invention is intended for the induction of anorexia
• the composition will normally be in the form of a solid unit dosage form which contains from 0.5 mg. to 200 mg. of active ingredient, for example 1 mg. to 100 mg. of active ingredient.
• composition of this invention is intended for mood-modification such as anti-depressant effects, it is likely that it will be used as a solid unit dosage form which contains from 0.05 to 50 mg. of active ingredient, for example 1 mg. to 25 mg. of active ingredient.
• this invention provides a method of suppressing appetite, which comprises administering an anorexically effective amount of a compound of this invention.
• this invention provides a method of reducing depression which comprises administering an antidepressively effective amount of a compound of this invention.
• the useful anorexic activity of compounds of this invention may be determined by the oral administration to hungry rats of the compound and measuring the reduction in their food intake.
• the results given in Table 1 were obtained for compounds of the formula (VII): ##STR9## wherein R 14 , R 15 , R 16 , R 17 and HX have the meanings given in Table 1.
• the preferred isomers of the compounds of the formula (II) for the induction of anorexia are those which have the same stereochemistry as (-) -7- dimethylaminoethyloxy -2- methyl -4- phenyl -1,2,3,4- tetrahydroisoquinoline dihydrochloride.
• the useful mood modifying activity of the compounds of this invention may be determined by standard test such as the Reserpine Prevention test which demonstrates the ability of the compounds to prevent reserpine induced hypothermia in mice.
• the approximate dose in mg/kg at which certain compounds of the formula (VII b) are active on the Reserpine Prevention test in the mouse is given in Table 2: ##STR10## wherein R 17 , R 18 , R 19 and HX have the meanings given in Table 2.
• 1,2,3,4 - tetrahydro -2- methyl -7- (2-dimethylaminoethoxy) -4-phenyl - isoquinoline hydrochloride and 4 - (3-trifluoromethyl phenyl) - 1,2,3,4 - tetrahydro -2-methyl -7- (2 - dimethylaminoethoxy) isoquinoline hydrochloride have approximate oral LD 50's in the mouse of 280 mg/kg and greater than 100 mg/kg respectively.
• the present invention also provides processes for the preparation of the compounds of this invention as follows: (a) The compounds of the formula (II) may be prepared from the corresponding compound of the formula (VIII) ##STR11## and salts thereof wherein R 1 , R 3 , R 4 and R 5 are as defined in relation to formula (II) by reaction with an etherifying agent such as that of the formula QR 2 or an acid addition salt thereof wherein R 2 is as defined in relation to formula (II) and Q is a readily displaceable group.
• Suitable groups Q are those readily displaced by nucleophilic groups and include the chlorine, bromine and iodine atoms and the hydroxyl group esterified by methane sulphonic, toluene sulphonic or like acid activated ester.
• Particularly suitable groups Q include iodine atoms.
• Suitable solvents include hydrocarbons such as toluene or xylene, ethers such as dimethoxyethane or tetrahydrofuran or ketones such as acetone, alcohols such as ethanol and other conventional solvents.
• the anion of the compound of formula (VIII) may be produced before the etherification reaction or may be produced in situ by reaction with a base such as NaH or the like.
• reaction is substantially complete in a conveniently short time if an elevated temperature is used.
• the reaction may be carried out at from about 0° -180° C, preferably in the region of 50° -120° C.
• the compounds of formula (VIII) may be prepared by the demethylation of the corresponding compound of the formula (IX): ##STR12## brought about by treatment with a strong acid such as hydrobromic acid.
• the compounds of the formula (II) may be prepared by the reaction of an amine R 6 R 7 NH with a compound of the formula (X): ##STR13## wherein R 1 , R 3 , R 4 , R 5 , R 6 and R 7 are as defined in relation to formula (II), Y is a ##STR14## group wherein R 8 , R 9 and R 10 are as defined with respect to formula (II) and Q is a readily displaceable group or when it is required to form a compound of the formula (II) wherein R 8 is a hydrogen atom Q may be taken together with Y to form a ##STR15## group.
• Suitable displaceable groups Q include those as herein before defined.
• Such a reaction may take place at any non-extreme temperature for example, 0° C. - 180° C. but generally ambient or moderately elevated temperatures, for example 12° C. - 100° C. are particularly suitable.
• the displacement reaction normally takes place in an organic solvent such as ethanol, ether or the like.
• the compounds of the formula (II) may be prepared by the cyclisation of a compound of the formula (XI): ##STR16## and salts thereof wherein R 1 , R 2 , R 3 , R 4 and R 5 are as defined in relation to formula (II) and Q 1 is a group Q wherein Q is a readily displaceable group as hereinbefore defined.
• Q 1 is a hydroxyl group or a C 1-4 acyloxy group.
• Such a process may be effected in the presence of an acidic cyclisation agent at a non-extreme temperature in a solvent.
• Suitable acidic cyclisation agents are sulphuric acid, phosphoric acid, boron trifluoride, aluminium chloride, tin tetrachloride, etc.
• the temperature will be between 10° C. and 150° C.
• the compounds of the formula (II) may be prepared by the reduction of a compound of the formula (XII) ##STR17## wherein R 1 , R 2 , R 3 , R 4 and R 5 are as defined in relation to formula (II).
• Such a reduction may suitably be effected in the presence of a transition metal catalyst and hydrogen or by a complex alkali metal hydride in an organic solvent at a non-extreme temperature.
• the transition metal catalyst is platinum, palladium or rhodium or a derivative thereof.
• the reduction is carried out in a lower alkanol at a temperature of -20° C to +100° C.
• the complex metal hydride is sodium borohydride or lithium aluminium hydride.
• the compounds of the formula (II) may be prepared by the reduction of a compound of the formula (XIII) ##STR18## wherein R 1 , R 2 , R 3 , R 4 and R 5 are as defined in relation to formula (II) and Y is an anion of an acid.
• Such a reduction may suitably be effected in the presence of a transition metal catalyst and hydrogen or a complex alkali metal hydride in an organic solvent at a non-extreme temperature.
• the transition metal catalyst is platinum, palladium or a derivative thereof and the complex alkali metal hydride is sodium borohydride or lithium aluminium hydride.
• the reaction is carried out in a lower alkanol or in the case of lithium aluminium hydride an open chain or cyclic ether.
• the compounds of the formula (II) may be prepared by the reduction of a compound of the formula (XIV) ##STR19## wherein R 1 , R 2 , R 3 , R 4 , and R 5 are as defined in relation to formula (II). and Y - is an anion of an acid.
• Such a reduction may suitably be effected with lithium aluminum hydride in an open-chain or cyclic ether, for example diethylether, tetrahydrofuran, dioxan or the like, at a non-extreme temperature such as -30° C. to +100° C.
• the compounds of the formula (II) wherein R 7 is a hydrogen atom may be prepared by the hydrogenation of the corresponding compound of the formula (II) wherein R 7 is a group removable by hydrogenolysis.
• Such a reduction may suitably be effected by a complex alkali metal hydride such as lithium aluminium hydride in an ethereal solvent, for example diethyl ether, tetrahydrofuran or dioxan, at a non-extreme temperature, i.e. -30° C. to +100° C.
• a complex alkali metal hydride such as lithium aluminium hydride in an ethereal solvent, for example diethyl ether, tetrahydrofuran or dioxan
• the alkylation process in (j) and (k) as hereinbefore described may be performed by conventional methods of alkylation.
• Particularly suitable methods of alkylation include reductive alkylation using an aldehyde in the presence of a reducing agent.
• compounds of the formula (II) wherein R 4 , R 6 , and/or R 7 are methyl groups may be prepared by reaction with formaldehyde in the presence of formic acid or by reaction with formaldehyde in the presence of a reducing agent such as hydrogen and a transition metal catalyst.
• a reducing agent such as hydrogen and a transition metal catalyst.
• Such reaction normally takes place at a non-extreme temperature such as -10° C. to +120° C. for example, 10° C. to 60° C. and preferably at ambient temperature.
• Such reaction frequently takes place in a conventional organic solvent.
• the compounds of the formula (X) may be prepared by: (a) the reduction of a compound of the formula (XVII) or (XVIII): ##STR23## with a complex metal hydride or (b) heating a compound of the formula ##STR24## with a compound of the formula (XIX): ##STR25## in an inert hydrocarbon; wherein R 1 , R 2 , R 3 , R 4 and R 5 are as defined with respect to formula (XII).
• the compounds of the formula (XII) may be prepared by the reaction of a compound of the formula (XX): ##STR26## wherein R 2 , R 3 , R 4 and R 5 are as defined in relation to formula (XV) and a metal derivative R 1 M where M is Li, Na, MgI, MgBr or MgCl in conventional manner followed by dehydration.
• the initial step of such reaction takes place in aprotic media, for example, in an ether solvent such as diethylether, tetrahydrofuran, dimethoxyethane or the like.
• the dehydration stage may conveniently be carried out using an aqueous or alkanolic solution of an acid in conventional manner.
• the compounds of the formula (XIII) may be prepared by the cyclodehydration of a compound of the formula (XXI). ##STR27## wherein R 1 , R 2 , R 3 , and R 5 are as defined in relation to formula (X); followed by the modification of the secondary amine group as required.
• Such a cyclisation process will be carried out in the presence of a condensing agent and suitably in the presence of phosphorus pentoxide or zinc chloride.
• Certain compounds of the formula (II) can be prepared as their optically active forms by the resolution of a compound of the formula (IX) as hereinbefore defined followed by the transformation of the resolved compound of the formula (IX) into a compound of the formula )II0 (II) the manner described herein.
• the compound of the formula (IX) may be resolved by the reaction of a compound of the formula (IX) wherein R 4 is a hydrogen atom with an optically active acid, for example, (+)- or (-)- tartaric acid, or (+)- or (-)- dibenzoyl tartaric acid followed by the conversion of the so-formed optically active salt in the optically active form of the compound of the formula (IX) by base.
• an optically active acid for example, (+)- or (-)- tartaric acid, or (+)- or (-)- dibenzoyl tartaric acid
• reaction of the compound of the formula (IX) with the optically active acid will normally take place in a suitable aqueous or organic solvent, for example a lower alkanol such as methanol or ethanol, at a non-extreme temperature, such as -10° C to +100° C. for example ambient temperature.
• a suitable aqueous or organic solvent for example a lower alkanol such as methanol or ethanol, at a non-extreme temperature, such as -10° C to +100° C. for example ambient temperature.
• optically active salt will usually be converted into the optically active compound of the formula (IX) by reaction with a solution of an inorganic base, such as carbonate or hydroxide, in water at a non-extreme temperature, for example ambient temperature.
• an inorganic base such as carbonate or hydroxide
• the groups R 4 , R 6 , R 7 and R 8 of the compounds of the formula (II) may be converted into other groups R 4 , R 6 , R 7 and R 8 by conventional methods well known to those skilled in the art.
• ⁇ (DMSO) 2HBr salt 7.15 (6H,s), 7.0 (3H,s), 6.8-6.1 (5H,m), 5.8-5.2 (4H,m), 3.5-2.9 (3H,m), 2.9-2.4 (4H,m), 0.5-0.5 (2H, broads) m.p. 173°-176° (ethanol-ether).
• Phenyl-lithium (126 ml, 2N) was added dropwise under nitrogen to a solution of (6) (21g) in dry tetrahydrofuran (200 ml) at 70°. The solution was warmed to room temperature and left to stir for 1 hr. Water (50ml) was added and the tetrahydrofuran was removed under reduced pressure. The residue was extracted with ether and the combined ether layers dried (MgSO 4 ). Removal of the solvent under reduced pressure gave the title compound.
• the salt was suspended in water (200 ml), 2N NaOH added to pH 10 and the suspension extracted with ether. The ether was washed (H 2 O, saturated NaCl) dried and evaporated to give a pale yellow oil (2.60 g). 100 mg of the compound was dissolved in dry ether and the hydrochloride prepared with ethereal HCl. The white crystalline salt was filtered, washed with ether and dried wt. 105 mg. m.p. 231°-3° C. [ ⁇ ] D 25 + 23.0° (H 2 O).
• (+)- 7 -methoxy- 4 -phenyl- 1,2,3,4 tetrahydroisoquinoline (2.4 g) was dissolved in methanol (50 ml) and 35% formaldehyde solution (3 ml) was added. The solution was stirred at ambient temperature for two hours when Raney nickel (1 g) was added and the solution hydrogenated at Atmospheric Pressure. The catalyst was removed by filtration, washed with ethanol and the filtrate and washings evaporated under reduced pressure to give the title compound as a colourless oil. Treatment of the title compound with ethereal hydrogen chloride gave its hydrochloride salt (2.3 g), m.p. 242° - 3° C. (dec) (methanol-ether) [ ⁇ ] D 25 + 21.8° (water).
• This compound was prepared by an analogous method to the (+ -isomer. m.p. 241°-2° C. (dec) (methanol-ether) [ ⁇ ] D 25 - 20.0° (water).

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• 1975
  • 1975-08-09 GB GB33283/75A patent/GB1504424A/en not_active Expired
• 1976
  • 1976-07-28 IE IE1668/76A patent/IE43506B1/en unknown
  • 1976-07-29 NZ NZ181619A patent/NZ181619A/xx unknown
  • 1976-07-29 ZA ZA764555A patent/ZA764555B/xx unknown
  • 1976-07-30 BE BE169475A patent/BE844783A/xx unknown
  • 1976-07-30 SE SE7608641A patent/SE7608641L/xx not_active Application Discontinuation
  • 1976-07-30 IL IL50176A patent/IL50176A/xx unknown
  • 1976-08-02 US US05/710,446 patent/US4113869A/en not_active Expired - Lifetime
  • 1976-08-05 CH CH1002076A patent/CH622780A5/de not_active IP Right Cessation
  • 1976-08-05 DE DE19762635276 patent/DE2635276A1/de not_active Withdrawn
  • 1976-08-06 AT AT586876A patent/AT354448B/de not_active IP Right Cessation
  • 1976-08-06 ES ES450550A patent/ES450550A1/es not_active Expired
  • 1976-08-06 CA CA258,633A patent/CA1076119A/en not_active Expired
  • 1976-08-06 DK DK357976A patent/DK357976A/da not_active Application Discontinuation
  • 1976-08-09 AU AU16702/76A patent/AU498422B2/en not_active Expired
  • 1976-08-09 JP JP51094721A patent/JPS5223083A/ja active Pending
  • 1976-08-09 NL NL7608856A patent/NL7608856A/nl not_active Application Discontinuation
  • 1976-08-09 FR FR7624258A patent/FR2320755A1/fr active Granted
  • 1976-08-09 HU HU76BE1265A patent/HU173560B/hu unknown
• 1977
  • 1977-09-01 ES ES462059A patent/ES462059A1/es not_active Expired
  • 1977-09-01 ES ES462058A patent/ES462058A1/es not_active Expired
  • 1977-09-01 ES ES462060A patent/ES462060A1/es not_active Expired
  • 1977-09-01 ES ES77462062A patent/ES462062A1/es not_active Expired
  • 1977-09-01 ES ES462061A patent/ES462061A1/es not_active Expired
• 1978
  • 1978-10-05 AT AT717378A patent/AT353793B/de not_active IP Right Cessation
• 1981
  • 1981-01-27 CH CH52281A patent/CH626611A5/de not_active IP Right Cessation

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